The setup routine for SCVMM asks you to enter the domain name (domainusername) and password of a service account for the SCVMM service to log in with. If you get the below error then you have missed a step:
Add the service account to the local Administrators group of the VMM management server. The wizard should complete once that is done. If you’re doing this via Group Policy Restricted groups then don’t forget to run GPUPDATE /FORCE to force the policy to run immediately.